CN101784401B

CN101784401B - Radial pneumatic tire

Info

Publication number: CN101784401B
Application number: CN2008801040189A
Authority: CN
Inventors: 渡部亮一; 山口宏二郎
Original assignee: Bridgestone Corp
Current assignee: Bridgestone Corp
Priority date: 2007-07-05
Filing date: 2008-07-01
Publication date: 2013-02-20
Anticipated expiration: 2028-07-01
Also published as: EP2177376B1; CN101784401A; EP2177376A1; WO2009005056A1; JP2009012648A; EP2177376A4; US9409446B2; US20100212794A1

Abstract

A radial pneumatic tire excellent in both drive performance and braking performance on a road covered with snow and ice and also excellent in maneuvering stability on a normal road. These are achieved by reliably suppressing large falling deformation of split block sections divided by sipes arranged in each block and, in addition, by effectively preventing narrowing deformation of the sipes. A tread surface (1) has blocks (4) divided by circumferential grooves (2) and lateral grooves (3) arranged on the tread surface (1), and each block (4) has the sipes (5). At the bottom of each sipe (5), there is provided at least one upward directed projection (7) integrally connecting facing wall surfaces of the sipe (5).

Description

Pneumatic belt tire

Technical field

The present invention relates to a kind of Pneumatic belt tire, particularly a kind ofly drive excellent in stability and the Pneumatic belt tire of driveability and deceleration and stopping performance excellence on ice and snow road in general road.

Background technology

Usually use the tire that is known as studless tire (studless tire) to use Pneumatic belt tire as travelling at ice and snow road.Studless tire generally has a plurality of pattern blocks (block) that form by tread surface is divided, and is arranged on a plurality of tire sipes (sipe) in the pattern block in the mode of extending along tire width direction.

The generic instance that is formed on the tire sipe in the pattern block comprises: so-called two-dimentional tire sipe, wherein tire sipe to the opening of the ground plane of tyre surface for example with wavy, zig-zag or linearity extends and this extended configuration of tire sipe is identical with the extended configuration maintenance at the ground plane place of tyre surface in any position of the depth direction of tire sipe; And so-called three-dimensional tire sipe, this three-dimensional tire sipe not only for example extends with specific wavy, zig-zag on the ground plane of tyre surface but also the depth direction at tire sipe.

Because the wedged ice and snow road of each tire sipe and generation strengthen the ground plane of tyre surface and " edge effect " (edge effect) of the friction force between the road surface, so these tire sipes can strengthen propulsive effort on the direction vertical with the bearing of trend of tire sipe, braking force etc.

In addition, when under tire applies the state of load thereon, rotating, because the thin water film that each tire sipe in these tire sipes will generate at ice and snow road owing to ice-out attracts to be removed to the inside of tire sipe, increased thus the area of contact between road surface and each the pattern block surface, namely increased the area of contact between the ground plane of road surface and tyre surface, so tire sipe can play respectively the effect that improves driveability, deceleration and stopping performance and driving stability.

Therefore, present simultaneously the edge effect that caused by its sipe openings edge and the studless tire of the moisture film removal effect that caused by tire sipe self can be brought into play the rideability of the excellence on ice and snow road.

Even when larger power is applied to the ground plane of tyre surface or more directly be applied on the pattern block surface, need to make the groove volume of tire sipe keep enough large, effectively to attract to remove moisture film by tire sipe.Given this, the partitioning portion of being cut apart by tire sipe of pattern block should have respectively rigidity to a certain degree, even when each partitioning portion of pattern block bears flexure deformation, this rigidity should be able to prevent that also tire sipe from narrowing down partly or integrally or be out of shape.

On the other hand, if increase the quantity of the tire sipe that is formed on the pattern block surface, to strengthen the edge effect that between the ground plane of tyre surface and ice and snow road, produces, then the rigidity of each partitioning portion of being divided by tire sipe of pattern block descends, and the amplitude of the collapse-deformation of each partitioning portion of pattern block increases, area of contact between pattern block integral body and the road surface reduces thus, and driving stability may worsen.

Structure about tire sipe formation, in the situation that forms three-dimensional tire sipe, when each partitioning portion of each pattern block is applying under the effect of external force thereon and is suffering flexure deformation, the jagged protuberance of tire sipe and recess support each other at the depth direction of tire sipe, compare with two-dimentional tire sipe, owing to increased the rigidity of pattern block, therefore suppress the reducing of area of contact between pattern block and the ground, and because therefore contact very uniformly between pattern block and the ground can prevent from driving stable the deterioration to a certain extent.Yet, when will larger power being applied to the ground plane of tyre surface or more directly being applied on the pattern block, still there be the misgivings of collapse-deformation by a relatively large margin of the partitioning portion of pattern block, this collapse-deformation may cause the narrow distortion of tire sipe.

In addition, TOHKEMY 2007-055285 communique discloses following technology: each cell wall faced mutually that faces with each other at tire sipe is provided with cylindrical protrusion, thereby when each partitioning portion flexure deformation of pattern block, the projection of facing mutually of each cell wall contacts with each other, to support each partitioning portion of pattern block, by guaranteeing enough large volumes of tire sipe, guarantee actv. water storage and draining.

Yet, in TOHKEMY 2007-055285 communique in the disclosed tire situation, when each partitioning portion of pattern block is applying under the effect of larger power thereon and significantly during flexure deformation, for example may occur that the position of each projection of facing mutually each other at each cell wall place of tire sipe does not line up, the effect that infringement supports each other based on projection.

In addition, may there be following situation: although not the lining up of position of aforesaid projection do not occur, but can not only be supported to the remarkable large input of pattern block by projection, the distortion of the partitioning portion of pattern block is very large thus, the function that stops tire sipe performance expectation, and/or driving stability may worsen.

Further, studless tire is used in usually as on the general road such as main line face or wet road surface and the ice and snow road.Therefore, increase the quantity of the tire sipe that arranges if only consider the driveability, deceleration and stopping performance etc. on ice and snow road, the rigidity of whole pattern block may be not, and each partitioning portion of pattern block may present excessive collapse-deformation at main line face or wet road surface, area of contact between pattern block and the ground plane reduces thus, and driving stability may worsen.

Summary of the invention

The problem that invention will solve

Therefore, the purpose of this invention is to provide a kind of Pneumatic belt tire, the collapse-deformation by a relatively large margin of the partitioning portion of dividing by the tire sipe that is arranged at pattern block that effectively suppresses pattern block, and by effectively preventing the narrow distortion of tire sipe, this Pneumatic belt tire is in the driving excellent in stability on the general road and the driveability on ice and snow road and deceleration and stopping performance excellence.

For the scheme of dealing with problems

Pneumatic belt tire according to the present invention comprises: tyre surface, and it has ground plane; A plurality of circumferential slots, described a plurality of circumferential slots all are arranged at the ground plane of described tyre surface in the mode of circumferentially extending along tyre surface; A plurality of transverse grooves, thus described a plurality of transverse groove all is arranged at the ground plane of described tyre surface to extend the mode that intersects with described circumferential slot along the tread width direction, thus intersect with described circumferential slot; Pattern block, its described circumferential slot and described transverse groove by the ground plane of described tyre surface marks off; And a plurality of tire sipes, described a plurality of tire sipe is positioned in the described pattern block, preferably be arranged in each pattern block, with with circumferentially compare more the mode that tilts towards described tread width direction towards described tyre surface and extend, described Pneumatic belt tire is characterised in that the bottom of each tire sipe is provided with at least one projection that projects upwards that connects as one integratedly for each cell wall faced mutually with described tire sipe.

In the present invention, the structure that circumferential slot and transverse groove can not only extend with linearity extends, but also can for example extend with zig-zag, structure wavy or crank-like.The shape of the developed surface view of the pattern block that is limited by a plurality of circumferential slots and transverse groove can be square, parallelogram, polygon or irregularly shaped.Can as required, suitably select the size of each pattern block, the quantity that is set up etc.

The projection that projects upwards is not limited to the projection that linearity projects upwards, and can be curve-like the projection that projects upwards.The upper end of projection can be linearity or curvilinear.

Tire sipe certainly can have the structure that linearity extends or have zig-zag for example, wavy or structure that crank-like is extended.Tire sipe can be configured to two-dimentional tire sipe or three-dimensional tire sipe.

Tire sipe is not limited to both ends open to the tire sipe of circumferential slot and/or transverse groove, and can be two ends not opening to the tire sipe of circumferential slot and/or transverse groove, perhaps only an end opening to the tire sipe of circumferential slot or transverse groove.

In the present invention, the statement of " tire sipe with circumferentially compare more the mode that tilts towards the tread width direction towards tyre surface extend " refers to that the tire sipe edge component of extending along the tread width direction is larger than the tire sipe edge component of circumferentially extending along tyre surface.

Further, " along the length at the end of tire sipe " refers to along the length of the line of centers of the Width at the end of tire sipe.

Further, " upper end of projection " represents regardless of the structure of the top surface of projection etc., the upper end structure of the part that the one that helps the tire sipe cell wall of projection connects.

In aforesaid tire, each projection along the length at the end of described tire sipe at 0.2mm in the scope of 2.0mm, and the upper end of described projection from the degree of depth of pattern block surface measurement preferably in 20% to 80% scope of the degree of depth of described tire sipe.

Be positioned at the quantity of projection of the tire sipe of the tire sipe of front side of a pattern block and/or rear side, for example be positioned at the quantity of projection of each tire sipe of the front side of a pattern block and rear side, preferably the quantity than the projection of the tire sipe of the pars intermedia that is positioned at this pattern block is large.

In the present invention, the tire sipe of the expression that " is positioned at the tire sipe of the pars intermedia of pattern block " and the hithermost position of mid point between the tire sipe of the tire sipe of the front side of pattern block and rear side.

Be positioned at the ratio of quantity and the quantity of the projection of the tire sipe of the pars intermedia that is positioned at this pattern block of projection of tire sipe of the tire sipe of front side of a pattern block and/or rear side preferably 1: 0.2 to 1: 1 scope.

Further, preferably the total sectional area than the projection of the tire sipe of the pars intermedia that is positioned at this pattern block is large to be positioned at the total sectional area of projection of tire sipe of the tire sipe of front side of a pattern block and/or rear side.

The width average along the tire sipe extension of the center-line-average that in the present invention, can begin to measure from the end from tire sipe of projection and projection obtains " sectional area " of projection.The summation of the sectional area of the projection of tire sipe is projection " total sectional area ".

Be positioned at the ratio of total sectional area and the total sectional area of the projection of the tire sipe of the pars intermedia that is positioned at this pattern block of projection of tire sipe of the tire sipe of front side of a pattern block and/or rear side preferably 1: 0.1 to 1: 1 scope.

In aforesaid anyon radial tire, for each pattern block in a plurality of pattern blocks row that marked off by described a plurality of circumferential slots and described a plurality of transverse groove, preferably the total quantity than the projection of the tire sipe of the pattern block of the central area that is positioned at described tyre surface is large to be arranged in the total quantity of projection of tire sipe of pattern block of each side of the outermost side of described tread width direction or outermost both sides; And more preferably, the total quantity than the projection of the tire sipe of the pattern block of each side of the adjacent both sides of the central area that is arranged in tyre surface is large.

In the present invention, expression is positioned at the pattern block at the tread contour center of close tyre surface " to be positioned at the pattern block of the central area of tyre surface ".

Be arranged in the ratio of total quantity and the total quantity of the projection of the tire sipe of the pattern block of the central area that is positioned at described tyre surface of projection of tire sipe of pattern block of each side of the outermost side of described tread width direction or outermost both sides preferably 1: 0.2 to 1: 1 scope.

For each pattern block in a plurality of pattern blocks row that marked off by described a plurality of circumferential slots and described a plurality of transverse groove, preferably the total sectional area than the projection of the tire sipe of the pattern block of the central area that is positioned at described tyre surface is large to be arranged in the total sectional area of projection of tire sipe of pattern block of each side of the outermost side of described tread width direction or outermost both sides.

Further, be arranged in the ratio of total sectional area and the total sectional area of the projection of the tire sipe of the pattern block of the central area that is positioned at described tyre surface of projection of tire sipe of pattern block of each side of the outermost side of described tread width direction or outermost both sides preferably 1: 0.1 to 1: 1 scope.

The effect of invention

According to Pneumatic belt tire of the present invention, when when tire applies the situation of load thereon on ice and snow road under, rotating, be formed in the mode of circumferentially extending along tyre surface in the ground plane of tyre surface a plurality of circumferential slots and to be formed on a plurality of transverse grooves in the ground plane of tyre surface along extending on the tread width direction in the mode of intersecting with these circumferential slots, under the effect of its groove edge, all help to improve respectively antiskid capability, driveability and deceleration and stopping performance.

Further, according to Pneumatic belt tire of the present invention, since tire sipe with circumferentially compare towards described tyre surface more in the mode that described tread width direction is extended obliquely is formed on the described pattern block of being divided by circumferential slot and transverse groove, therefore when vehicle driven or when braking on ice and snow road, can be by improving reliably propulsive effort and braking force as the tire sipe in the pattern block with respect to the edge effect of the effect on road surface.

Further, according to tire of the present invention, the end that is formed on as mentioned above a plurality of tire sipes in the pattern block, be provided with at least one that each cell wall of facing mutually of described tire sipe is connected to each other and the more than one projection that projects upwards preferably, so that each partitioning portion of being cut apart by each tire sipe of each pattern block is joined to one another by projection, and each partitioning portion of each pattern block can always support each other reliably.As a result, by the cooperation of partitioning portion self, can suppress the flexure deformation of the partitioning portion of each pattern block.

Therefore; the edge effect that not only can cause by the edge of opening by tire sipe strengthens propulsive effort, braking force etc.; and under the effect by means of the reliable and stable support of projection between the partitioning portion; can guarantee the rigidity of the partitioning portion of being cut apart by tire sipe of pattern block; thereby can prevent that area of contact from reducing, and for example can improve driving stability.

Further, when the partitioning portion of pattern block suffers flexure deformation, under the constraint of the partitioning portion of realizing between by partitioning portion self, enough gaps between the cell wall that can obtain reliably to face mutually, required tire sipe volume can be obtained reliably thus, the actv. water removal effect can be obtained thus.

Further; when when tire applies the situation of load thereon on such as general road such as main line face or wet road surfaces under, travelling; the collapse-deformation that can advantageously suppress each partitioning portion of each pattern block by the projection in the tire sipe; compare with the tradition wheel; can guarantee thus the high stiffness of pattern block integral body and enough large ground contact area, drive stability thereby can strengthen.

Description of drawings

Fig. 1 is the local expansion figure of tread contour that the embodiment of Pneumatic belt tire of the present invention is shown.

Fig. 2 is the local amplification stereogram that the pattern block in the tread contour shown in Figure 1 is shown.

Fig. 3 is the sectional block diagram of cutting open along the III-III line of Fig. 2.

Fig. 4 is the cutaway view of cutting open along the IV-IV line of Fig. 2.

Fig. 5 is the circumferential cutaway view of tyre surface of pattern block that is formed at the ground plane of tyre surface, and the figure that the quantity of the projection in each tire sipe that is arranged on pattern block is shown.

Fig. 6 is the expansion planar view that five pattern blocks row of tread contour shown in Figure 1 are shown, and the figure that the total quantity of the projection in the tire sipe in the pattern block that is arranged on each pattern block row is shown.

Fig. 7 is the sectional block diagram that is used to form the cutter of tire sipe of the present invention.

Fig. 8 is the front elevation of the cutter of Fig. 7.

Fig. 9 is the cutaway view that the tire that uses is in an embodiment cut open along the IV-IV line of Fig. 2.

Figure 10 is the cutaway view of the projection used among the embodiment.

Description of reference numerals

The ground plane of 1 tyre surface

2 circumferential slots

3 transverse grooves

4 pattern blocks

4a lateral areas pattern block

4b central area pattern block

5 tire sipes

5a front side tire sipe

5b rear side tire sipe

6 pattern blocks row

7 projections

The partitioning portion of 8 pattern blocks

11 cutters

12 slits

The specific embodiment

Hereinafter, with reference to the accompanying drawings Pneumatic belt tire of the present invention is elaborated.

Fig. 1 is the local expansion figure of tread contour (tread pattern) that the embodiment of Pneumatic belt tire of the present invention is shown.Fig. 2 is the local amplification stereogram that the pattern block in the tread contour shown in Figure 1 is shown.

In Fig. 1, the ground plane of Reference numeral 1 expression tyre surface, Reference numeral 2 expressions are with a plurality of ring-type circumferential slots in the ground plane 1 that is arranged on tyre surface along the circumferential mode of extending of tyre surface, a plurality of transverse grooves that Reference numeral 3 expression is extended along the tread width direction in the mode of intersecting with each circumferential slot 2, Reference numeral 4 represent the pattern block that limited by a plurality of circumferential slots 2 and a plurality of transverse groove 3; Reference numeral 5 expression is arranged on a plurality of tire sipes in each pattern block 4, described tire sipe with circumferentially compare the mode that more tilts towards the tread width direction towards tyre surface and extend.

In structure shown in Figure 1, in the ground plane 1 of tyre surface, four circumferential slots 2 that circumferentially extend point-blank along tyre surface are configured to, so that the width of each circumferential slot is 5.0mm～8.0mm, the degree of depth is 8mm～9mm, and a plurality of transverse grooves 3 that extend along the tread width direction in the mode of intersecting with these circumferential slots 2 are configured to, so that the width of each transverse groove is 3.0mm～7.0mm, the degree of depth is 7mm～9mm, thus

groove

2,3 and the tyre surface side between limit the pattern block row 6 of five row.

In this embodiment, in each pattern block 4 of each pattern block row 6, form four tire sipes 5, so that each tire sipe with circumferentially compare more the mode that tilts towards the tread width direction towards tyre surface and extend, for example each tire sipe 5 is so-called three-dimensional structure, the width of this structure is in the scope of 5mm～40mm, and the degree of depth is in the scope of 6.0mm～10.0mm.Tire sipe 5 shown in the figure is the three-dimensional tire sipes that all extend with the zig-zag form on tread width direction and tread depth direction.

In addition, in the tire of present embodiment, as shown in Figure 3 and Figure 4, the bottom of each tire sipe 5 is provided with at least one projection that projects upwards 7 that the cell wall of facing mutually with tire sipe 5 connects as one.

In this embodiment, each projection 7 along the length at the end of tire sipe 5 in the scope of 0.2mm～2.0mm, the upper end of projection (projection upper end) from the degree of depth of pattern block surface measurement in 20%～80% scope of the tire sipe degree of depth.

By with the length setting at the bottom of the tire sipe of each projection 7 in the scope of 0.2mm～2.0mm, the collapse-deformation that can suppress the partitioning portion (sectioned portion) 8 of each pattern block, guaranteeing on such as general road such as main line face or wet road surfaces and enough large ground contact areas on ice and snow road, and water can be excreted in the tire sipe reliably.Namely, can therefore improve driving stability.

In the short situation of the Length Ratio 0.2mm at the bottom of tire sipe, the collapse-deformation of the partitioning portion 8 of each pattern block can not be suppressed, and ground contact area may be reduced, the reducing of ground contact area is tending towards making the driving stability on the ice road surface to worsen.Surpass in the situation of 2.0mm in the length at the bottom of tire sipe, the volume that can attracted to the water in the tire sipe 5 reduces, and except the water function reduction, the reduction that removes water function aggravates and drives stability.

In addition, be set in by the degree of depth from the pattern block surface measurement with projection upper end in 20%～80% the scope of the tire sipe degree of depth, when using new tire (brand-new tire) on the ice road surface, the partitioning portion 8 of each pattern block is collapse-deformation moderately, therefore can obtain simultaneously edge effect and remove the moisture film effect.

Surpass in the degree of depth from the pattern block surface measurement of projection upper end in 80% the situation of the tire sipe degree of depth, can not suppress the collapse-deformation of the partitioning portion 8 of each pattern block, ground contact area reduces thus, and the driving stability on the ice road surface aggravates.Projection upper end in the degree of depth of pattern block surface measurement 20% situation less than the tire sipe degree of depth, the volume that can be contained in the water in the tire sipe 5 reduces, and make except the water function reduction, the deceleration and stopping performance on ice and snow road and driveability aggravate thus.

Fig. 4 is the cutaway view of cutting open along the IV-IV line of Fig. 2.Fig. 5 is the circumferential cutaway view of tyre surface along the pattern block of the ground plane of the tyre surface that is formed at Fig. 1, and the figure that the quantity of the projection in each tire sipe that is arranged on pattern block is shown.

In the preferred embodiment that single pattern block is analyzed, the quantity of the projection 7 that the quantity of the quantity of the projection 7 that the front side tire sipe 5a in the front side that is positioned at pattern block 4 arranges and the projection 7 that arranges at the rear side tire sipe 5b of the rear side that is positioned at pattern block 4 arranges than the tire sipe at the pars intermedia that is positioned at pattern block 4 respectively is large.

When external force was applied on the pattern block, the collapse-deformation of less degree occured because the support that is provided by other partitioning portion 8 adjacent with this (these) partitioning portion 8 near the pars intermedia that is positioned at pattern block of each pattern block 4 partitioning portion 8 naturally.By contrast, when larger power is applied on the pattern block 4, because the partitioning portion 8 that is positioned at front side and rear side of each pattern block 4 does not have or almost less than adjacent any other partitioning portion that they are supported, therefore largely collapse-deformation may occur in these outermost partitioning portions 8, this largely collapse-deformation may reduce ground contact area.

In view of the above fact, in this embodiment, be arranged in the front side tire sipe 5a of pattern block 4 and/or be positioned at the quantity (quantity of the projection 7 of each tire sipe 5a, the 5b of Fig. 5) of projection 7 of last side tool groove decorative pattern 5b of pattern block 4 larger than the quantity of the projection 7 of the tire sipe of the pars intermedia that is positioned at pattern block 4, thereby the power that the partitioning portion 8 that can strengthen being positioned at the front side of pattern block 4 and rear side supports each other is namely resisted the constrained force of subsiding of flexure deformation (warping-deformation).As a result, prevent that effectively ground contact area from reducing, improve thus driveability and deceleration and stopping performance on ice and snow road, and improved the driving stability on general road.

In this case; by from the pars intermedia of pattern block towards the quantity that front side and the rear side of pattern block little by little increases the projection 7 in the tire sipe that is arranged on pattern block 4, can when preventing pattern block end collapse-deformation, obtain to guarantee the effect of the moisture removal property of pattern block centre.As a result, ground contact area increases, and improves thus driveability and deceleration and stopping performance on ice and snow road, and has improved the driving stability on general road.

In design as shown in Figure 5, the quantity that is arranged on the interior projection 7 of the quantity of the projection 7 in the front side tire sipe 5a of pattern block 4 and the rear side tire sipe 5b that is arranged on pattern block 4 is identical.Yet the quantity of the projection 7 in each

tire sipe

5a, 5b can differ from one another.

The quantity of the projection 7 in the front side tire sipe 5a of pattern block 4 and/or the last side tool groove decorative pattern 5b and the ratio of the quantity of the projection 7 of the tire sipe of the pars intermedia that is positioned at pattern block 4 are set at the scope of 1: 0.2 or 1: 1, are configured to especially 1: 0.5.As a result, can suppress the collapse-deformation of the partitioning portion 8 adjacent with last side tool groove decorative pattern 5b with the front side tire sipe 5a of pattern block 4, and can guarantee except water function.

In addition, make the total sectional area of the front side tire sipe 5a of pattern block 4 and/or the projection 7 in the last side tool groove decorative pattern 5b larger than the total sectional area of the projection 7 of the tire sipe of the pars intermedia that is positioned at pattern block 4.As a result, can suppress the collapse-deformation of the partitioning portion 8 adjacent with last side tool groove decorative pattern 5b with the front side tire sipe 5a of pattern block 4, and can guarantee except water function.

The total sectional area of the projection 7 in each tire sipe of pattern block 4 increases gradually from the pars intermedia of pattern block 4 front side tire sipe 5a and the last side tool groove decorative pattern 5b towards pattern block 4; can obtain thus to guarantee the effect except water function of the centre of pattern block, prevent simultaneously the end collapse-deformation of pattern block.As a result, ground contact area increases, and improves thus driveability and deceleration and stopping performance on ice and snow road, and has improved the driving stability on general road.

Being arranged on the total sectional area of the projection 7 in the front side tire sipe 5a of pattern block 4 and being arranged on the total sectional area of the projection 7 in the last side tool groove decorative pattern 5b of pattern block 4 can be mutually the same or differ from one another.

The total sectional area of the projection 7 in the front side tire sipe 5a of pattern block 4 and/or the last side tool groove decorative pattern 5b is set at 1: 0.1 to 1: 1 scope with the ratio of the total sectional area of the projection 7 of the tire sipe 5 of the pars intermedia that is positioned at pattern block 4, is configured to especially 1: 0.5.As a result, can suppress the collapse-deformation of the partitioning portion 8 adjacent with last side tool groove decorative pattern 5b with the front side tire sipe 5a of pattern block 4, and can guarantee except water function.

In structure shown in Figure 4, four tire sipes 5 that form in pattern block 4 are provided with projection 7.Yet, the part tire sipe 5 interior projections 7 that arrange that can only in pattern block 4, form.

Fig. 6 is the expansion planar view that five pattern block row of tread contour shown in Figure 1 are shown, and the figure that is illustrated in the total quantity of the projection in the tire sipe that arranges in the pattern block of each pattern block row.

In the preferred embodiment that whole tread contour is analyzed, the total quantity of projection 7 of each tire sipe 5 of central area pattern block 4b of pattern block of central area that the total quantity (quantity of the projection 7 of the tire sipe of two lateral areas pattern block 4a, the 4a of Fig. 6) of projection 7 of tire sipe 5a of pattern block of each side that is arranged in the both sides of the outermost side of the Width of tyre surface/outermost preferably is configured to be compared to tyre surface is large.

In tread contour, lateral areas pattern block 4a major effect deceleration and stopping performance and/or turning performance, central area pattern block 4b major effect deceleration and stopping performance and driveability.

Given this, for each pattern block 4 in a plurality of pattern block row of being demarcated by a plurality of circumferential slots 2 and transverse groove 3, be positioned at tyre surface Width an outermost side a lateral areas pattern block 4a tire sipe 5 projection 7 total quantity or be positioned at two lateral areas pattern block 4a of outermost side of the Width of tyre surface, total quantity (two lateral areas pattern block 4a among Fig. 6 of the projection 7 in the tire sipe 5 of 4a, the total quantity of the projection 7 in the tire sipe 5 of 4a) preferably the total quantity than the projection 7 in the tire sipe 5 of central area pattern block 4b is large, the collapse-deformation that suppresses thus the partitioning portion 8 of pattern block, particularly flexure deformation, and can prevent that ground contact area from reducing.As a result, utilize projection 7 mutually to support owing to protect the partitioning portion 8 of lateral areas pattern block 4a, can guarantee thus enough rigidity of the partitioning portion 8 of lateral areas pattern block 4a, and can improve in the deceleration and stopping performance on the ice and snow road and the stability of the driving on the general road.

The total quantity of the projection 7 of the tire sipe 5 interior settings in the central area pattern block 4b is less, reduced thus the mutual support that partitioning portion 8 utilizes projection 7, and the flexure deformation of enough degree occurs the partitioning portion 8 of pattern block 4b.As a result, further strengthen the edge effect at tire sipe edge, and can improve deceleration and stopping performance and acceleration capability on ice and snow road.

Therefore, the changes in distribution of the best of the total quantity by realizing the projection 7 in the tread contour can be improved deceleration and stopping performance, acceleration capability and driving stability simultaneously.

Preferably, the total quantity that is arranged on the projection 7 in the tire sipe 5 of pattern block 4 increases towards lateral areas pattern block 4a gradually from central area pattern block 4b, so that the quantity of projection 7 reduces towards central area pattern block 4b, and edge effect increases towards central area pattern block 4b.Because this improves driveability and deceleration and stopping performance on ice and snow road.In addition, because the quantity of projection 7 increases towards lateral areas pattern block 4a, therefore guarantee rigidity, also improved the driving stability on general road.

In design shown in Figure 6, be arranged on the total quantity of the projection 7 in the lateral areas pattern block 4a and be arranged on the total quantity of the interior projection 7 of another lateral areas pattern block 4a identical.Yet the total quantity of above-mentioned projection 7 can differ from one another.

The ratio of the total quantity of the projection 7 in the total quantity of the projection 7 in the tire sipe 5 of at least one lateral

areas pattern block

4a, 4a and the tire sipe of central area pattern block 4b 5 is set in 1: 0.2 to 1: 1 the scope, is configured to especially 1: 0.25.The edge effect of the central portion that mainly when accelerating, uses of the rigidity of the shoulder sidepiece of the tyre surface in the time of as a result, can obtaining to turn and tyre surface.

In addition, the total sectional area of the projection 7 in the tire sipe 5 of at least one lateral

areas pattern block

4a, 4a is configured to larger than the total sectional area of the projection 7 in the tire sipe 5 of central area pattern block 4b.As a result, the edge effect of the central portion that mainly when accelerating, uses of the rigidity of the shoulder sidepiece of tyre surface and tyre surface in the time of can obtaining to turn.

Preferably, the sectional area that is arranged on the projection 7 in the tire sipe 5 of each pattern block 4 increases towards lateral areas pattern block 4a gradually from central area pattern block 4b, so that the sectional area of projection 7 reduces towards central area pattern block 4b, and edge effect increases towards central area pattern block 4b.Because this improves driveability and deceleration and stopping performance on ice and snow road.In addition, guarantee rigidity because therefore the sectional area of projection 7 increases towards lateral areas pattern block 4a, also improved the driving stability on general road.

Being arranged on the sectional area of the projection 7 in the lateral areas pattern block 4a and being arranged on the sectional area of the projection 7 in another lateral areas pattern block 4a can be mutually the same or differ from one another.

In addition, the ratio of the total sectional area of the projection 7 in the total sectional area of the projection 7 in the tire sipe 5 of at least one lateral

areas pattern block

4a, 4a and the tire sipe of central area pattern block 4b 5 is set in 1: 0.1 to 1: 1 the scope, is configured to especially 1: 0.25.The edge effect of the central portion that mainly when accelerating, uses of the rigidity of the shoulder sidepiece of the tyre surface in the time of as a result, can obtaining to turn and tyre surface.

In Pneumatic belt tire of the present invention, opening is not limited to zig-zag to the extended configuration of the tire sipe 5 on the surface of pattern block 4, and can be linearity, crank-like (crank-like) or other required shape.The one or both ends of appointing of tire sipe 5 can be in pattern block 4 interior terminations.Tire sipe 5 can form has two-dimensional structure or three-dimensional structure.Therefore, although the tire sipe among the figure 5 is three-dimensional tire sipe, tire sipe 5 can be configured to two-dimentional tire sipe.

Fig. 7 be illustrate be mounted to sulfurizing mould and can be used to form tire sipe 5 and tire sipe 5 in the sectional block diagram of cutter (blade) of projection 7.Fig. 8 is the front elevation of cutter shown in Figure 7.

About the formation that is provided with the tire sipe 5 of projection 7 of the present invention, when with sulfurizing mould during to the green tire sulfidization molding, the slits in the cutter 11 allow rubber to invade wherein, and this rubber section forms projection 7, and cutter 11 self is discharged rubber, thereby forms tire sipe 5.

Performance test embodiment 1

Then, to be 195/65R15, pitch be 56 test radial-ply tyre to the specification of manufacturing structure such as Fig. 1, Fig. 9 and structure shown in Figure 10.The characteristic of test tire is varied to respectively embodiment tire 1, embodiment tire 2, embodiment tire 3 and comparative example tire 1.Analyze and respectively test the acceleration capability of tire on ice and snow road.

In these test tires, four circumferential slots all have following size: width is 5mm, and the degree of depth is 9mm, and transverse groove all has following size: width is 5mm, and the degree of depth is 9mm.Form four three-dimensional tire sipes in each pattern block of five pattern block row that circumferentially limit along tyre surface, each tire sipe all has following size: width is 30mm, and the degree of depth is 7mm.Each tire sipe is provided with the projection of following size: width is 0.5mm, and the degree of depth is 56% of the tire sipe degree of depth.

In each test tire, the quantity of the total projection that arranges in tread contour is configured to identical.Because the structure except the ground plane of tyre surface of tire does not need to change in the present invention, the structure of therefore testing the tire construction except the ground plane of tyre surface of tire and traditional radial-ply tyre is roughly the same.

In embodiment tire 1, projection is provided in whole tire sipes and distributes equably, and the interval with 7mm arranges three projections in each tire sipe.In embodiment tire 2, with the interval of 5mm four projections are set at each tire sipe of the front side that is positioned at each pattern block and rear side, with the interval of 10mm two projections are set at each tire sipe of the pars intermedia that is positioned at pattern block.In embodiment tire 3, be included in each tire sipe of pattern block of tyre surface central area of tread contour and be provided with projection, in each tire sipe of the pattern block adjacent with the central area pattern block all with three tire sipes that are arranged at intervals with of 7mm, and in each tire sipe of the pattern block of each tyre surface lateral areas all the interval with 5mm four projections are set.In comparative example tire 1, projection is not set in each tire sipe.

Acceleration capability

For each tire in embodiment tire 1 to 3 and the comparative example tire 1, wheel rim at tire and 6JJ is assembled together, inflates and be mounted to the weight of FR vehicle, chaufeur under the condition of 60kg take the interior pressure of 200kPa, measure and accelerate to the required pick-up time of 150km/h from 5km/h under the acceleration ultimate limit state that tire skids on the ice road surface keeping just preventing.

The result with the form of index shown in the table 1.Index is represented as with respect to the result's 100 of tire 1 relative value as a comparative example.Exponential quantity is larger, and the result is better.

Table 1

?	Embodiment tire 1	Embodiment tire 2	Embodiment tire 3	Comparative example tire 1
					Acceleration capability on the ice road surface	?102	?104	?105	?100

[0119]From the result of table 1, be understandable that, bossed embodiment tire 1 to 3 is set in tire sipe on the ice road surface, presents better acceleration capability than comparative example tire 1.In addition, should be understood that compare with the quantity of projection in the tire sipe in the pattern block of each lateral areas of tyre surface, the quantity by the projection in the tire sipe in the pattern block that reduces the tyre surface central area can further strengthen edge effect.

Performance test embodiment 2

Deceleration and stopping performance

For each tire of embodiment tire 1 to 3 and comparative example tire 1, measurement speed on ice and snow road is reduced to the required stopping distance of 0km/h from 20km/h under the full braking state that tire is locked fully.

The result with the form of index shown in the table 2.Index is represented as with respect to the result's 100 of tire 1 relative value as a comparative example.Exponential quantity is larger, and the result is better.

Table 2

?	Embodiment tire 1	Embodiment tire 2	Embodiment tire 3	Comparative example tire 1
					Deceleration and stopping performance on the ice road surface	?105	?108	?107	?100

From the result of table 2, be understandable that, bossed embodiment tire 1 to 3 is set in tire sipe on the ice road surface, presents better deceleration and stopping performance than comparative example tire 1.In addition, should be understood that the quantity of projection that is positioned at the tire sipe of the front side of each pattern block and rear side is configured to the reducing and good deceleration and stopping performance of ground contact area that the large embodiment tire 2 of quantity than the projection of the tire sipe of the pars intermedia that is positioned at pattern block presents less fetus face.

Performance test embodiment 3

Turning performance

For each tire of embodiment tire 1 to 3 and comparative example tire 1, estimate speed of response and the mobile particularity of vehicle when general road is turned, take extremely as full marks.

The result is shown in the table 3.Numerical value is larger, and the result is better.

Table 3

?	Embodiment tire 1	Embodiment tire 2	Embodiment tire 3	Comparative example tire 1
					Turning performance on the general road	?5.0	?5.3	?5.5	?4.0

From the result of table 3, be understandable that the embodiment tire 1 to 3 that the projection in the tire sipe has been strengthened each pattern block presents better turning performance than comparative example tire 1 on general face.In addition, should be understood that embodiment tire 3 presents the highest rigidity of pattern block of each lateral areas of tyre surface, and satisfactory.

Result from table 1 to table 3, be understandable that, bossed embodiment tire 1 to 3 is set in the tire sipe on the ice road surface, presents better acceleration capability and deceleration and stopping performance than comparative example tire 1, and on general road, present better turning performance than comparative example tire 1.

In addition, by changing the position of the projection in the tire sipe, can be suitable for disposing the tire of paying attention to turning performance or the tire of paying attention to icing the deceleration and stopping performance on the road surface.

Claims

1. Pneumatic belt tire, it comprises:

Tyre surface, it has ground plane;

A plurality of circumferential slots, described a plurality of circumferential slots all are arranged at the ground plane of described tyre surface in the mode of circumferentially extending along tyre surface;

A plurality of transverse grooves, thus described a plurality of transverse groove is all to extend the ground plane that the mode that intersects with described circumferential slot is arranged at described tyre surface along the tread width direction;

Pattern block, its described circumferential slot and described transverse groove by the ground plane of described tyre surface marks off; And

A plurality of tire sipes, described a plurality of tire sipes are arranged at described pattern block, and with circumferentially compare more the mode that tilts towards described tread width direction towards described tyre surface and extend, described Pneumatic belt tire is characterised in that,

The bottom of each tire sipe is provided with at least one projection that projects upwards that connects as one for each cell wall faced mutually with described tire sipe,

Be positioned at the quantity of projection of tire sipe of the tire sipe of front side of a pattern block and/or rear side greater than the quantity of the projection of the tire sipe of the pars intermedia that is positioned at this pattern block.

2. Pneumatic belt tire according to claim 1, it is characterized in that, each projection along the length at the end of described tire sipe at 0.2mm in the scope of 2.0mm, and the upper end of described projection from the degree of depth of pattern block surface measurement in 20% to 80% scope of the degree of depth of described tire sipe.

3. Pneumatic belt tire according to claim 1 and 2, it is characterized in that the ratio of quantity and the quantity of the projection of the tire sipe of the pars intermedia that is positioned at this pattern block of projection of tire sipe that is positioned at the tire sipe of front side of a pattern block and/or rear side was 1: 0.2 to 1: 1 scope and get rid of 1: 1.

4. Pneumatic belt tire according to claim 1 and 2, it is characterized in that, be positioned at the total sectional area of projection of tire sipe of the tire sipe of front side of a pattern block and/or rear side greater than the total sectional area of the projection of the tire sipe of the pars intermedia that is positioned at this pattern block.

5. Pneumatic belt tire according to claim 4, it is characterized in that the ratio of total sectional area and the total sectional area of the projection of the tire sipe of the pars intermedia that is positioned at this pattern block of projection of tire sipe that is positioned at the tire sipe of front side of a pattern block and/or rear side was 1: 0.1 to 1: 1 scope and get rid of 1: 1.

6. Pneumatic belt tire according to claim 1 and 2, it is characterized in that, for each pattern block in a plurality of pattern blocks row that marked off by described a plurality of circumferential slots and described a plurality of transverse groove, be arranged in the total quantity of projection of tire sipe of pattern block of each side of the outermost side of described tread width direction or outermost both sides greater than the total quantity of the projection of the tire sipe of the pattern block of the central area that is positioned at described tyre surface.

7. Pneumatic belt tire according to claim 6, it is characterized in that the ratio of total quantity and the total quantity of the projection of the tire sipe of the pattern block of the central area that is positioned at described tyre surface of projection of tire sipe of pattern block of each side that is arranged in the outermost side of described tread width direction or outermost both sides was 1: 0.2 to 1: 1 scope and get rid of 1: 1.

8. Pneumatic belt tire according to claim 1 and 2, it is characterized in that, for each pattern block in a plurality of pattern blocks row that marked off by described a plurality of circumferential slots and described a plurality of transverse groove, be arranged in the total sectional area of projection of tire sipe of pattern block of each side of the outermost side of described tread width direction or outermost both sides greater than the total sectional area of the projection of the tire sipe of the pattern block of the central area that is positioned at described tyre surface.

9. Pneumatic belt tire according to claim 8, it is characterized in that the ratio of total sectional area and the total sectional area of the projection of the tire sipe of the pattern block of the central area that is positioned at described tyre surface of projection of tire sipe of pattern block of each side that is arranged in the outermost side of described tread width direction or outermost both sides was 1: 0.1 to 1: 1 scope and get rid of 1: 1.